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<FONT color="green">001</FONT>    package edu.hawaii.myisern.model;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.io.File;<a name="line.3"></a>
<FONT color="green">004</FONT>    import java.sql.Connection;<a name="line.4"></a>
<FONT color="green">005</FONT>    import java.sql.DriverManager;<a name="line.5"></a>
<FONT color="green">006</FONT>    import java.sql.PreparedStatement;<a name="line.6"></a>
<FONT color="green">007</FONT>    import java.sql.ResultSet;<a name="line.7"></a>
<FONT color="green">008</FONT>    import java.sql.ResultSetMetaData;<a name="line.8"></a>
<FONT color="green">009</FONT>    import java.sql.Statement;<a name="line.9"></a>
<FONT color="green">010</FONT>    import java.sql.DatabaseMetaData;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.util.ArrayList;<a name="line.11"></a>
<FONT color="green">012</FONT>    import java.util.List;<a name="line.12"></a>
<FONT color="green">013</FONT>    <a name="line.13"></a>
<FONT color="green">014</FONT>    /**<a name="line.14"></a>
<FONT color="green">015</FONT>     * Provides SQL database interface to the application.<a name="line.15"></a>
<FONT color="green">016</FONT>     * <a name="line.16"></a>
<FONT color="green">017</FONT>     * Note: In embedded mode, connections are "free", so we make no effort to manage them via pooling.<a name="line.17"></a>
<FONT color="green">018</FONT>     * <a name="line.18"></a>
<FONT color="green">019</FONT>     * @author Philip Johnson<a name="line.19"></a>
<FONT color="green">020</FONT>     * @author Randy Cox<a name="line.20"></a>
<FONT color="green">021</FONT>     */<a name="line.21"></a>
<FONT color="green">022</FONT>    public class Database {<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>      private final String className = "Database";<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>      /** The JDBC driver. */<a name="line.26"></a>
<FONT color="green">027</FONT>      // private String driver = "org.apache.derby.jdbc.EmbeddedDriver";<a name="line.27"></a>
<FONT color="green">028</FONT>      private String driver = "org.apache.derby.jdbc.ClientDriver";<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>      /** The Derby connection URL. */<a name="line.30"></a>
<FONT color="green">031</FONT>      // private String connectionURL = "jdbc:derby:myisern;create=true";<a name="line.31"></a>
<FONT color="green">032</FONT>      private String connectionURL = "jdbc:derby://localhost:1527/myisern;create=true";<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>      /** Command to shutdown system. */<a name="line.34"></a>
<FONT color="green">035</FONT>      // private String shutdownURL = "jdbc:derby:;shutdown=true";<a name="line.35"></a>
<FONT color="green">036</FONT>      /** The key for putting/retrieving the directory where Derby will create its databases. */<a name="line.36"></a>
<FONT color="green">037</FONT>      private static final String derbySystemKey = "derby.system.home";<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>      /** Connection to database * */<a name="line.39"></a>
<FONT color="green">040</FONT>      private Connection connection = null;<a name="line.40"></a>
<FONT color="green">041</FONT>    <a name="line.41"></a>
<FONT color="green">042</FONT>      /** Short cut for start of SQL statement. */<a name="line.42"></a>
<FONT color="green">043</FONT>      public final String CREATE_TABLE = "CREATE TABLE ";<a name="line.43"></a>
<FONT color="green">044</FONT>    <a name="line.44"></a>
<FONT color="green">045</FONT>      /** Short cut for start of SQL statement. */<a name="line.45"></a>
<FONT color="green">046</FONT>      public final String DROP_TABLE = "DROP TABLE ";<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>      /** Short cut for start of SQL statement. */<a name="line.48"></a>
<FONT color="green">049</FONT>      public final String SELECT_FROM = "SELECT * FROM ";<a name="line.49"></a>
<FONT color="green">050</FONT>    <a name="line.50"></a>
<FONT color="green">051</FONT>      /** Short cut for start of SQL statement. */<a name="line.51"></a>
<FONT color="green">052</FONT>      public final String INSERT_INTO = "INSERT INTO ";<a name="line.52"></a>
<FONT color="green">053</FONT>    <a name="line.53"></a>
<FONT color="green">054</FONT>      /** Short cut for start of SQL statement. */<a name="line.54"></a>
<FONT color="green">055</FONT>      public final String UPDATE = "UPDATE ";<a name="line.55"></a>
<FONT color="green">056</FONT>    <a name="line.56"></a>
<FONT color="green">057</FONT>      /** Short cut for start of SQL statement. */<a name="line.57"></a>
<FONT color="green">058</FONT>      public final String DELETE_FROM = "DELETE FROM ";<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>      /** Short cut for start of SQL statement. */<a name="line.60"></a>
<FONT color="green">061</FONT>      public final String SELECT_COUNT = "SELECT COUNT(*) FROM ";<a name="line.61"></a>
<FONT color="green">062</FONT>    <a name="line.62"></a>
<FONT color="green">063</FONT>      /**<a name="line.63"></a>
<FONT color="green">064</FONT>       * Creates the persistent store for the myisern in ~/.myisern/db.<a name="line.64"></a>
<FONT color="green">065</FONT>       * <a name="line.65"></a>
<FONT color="green">066</FONT>       * @param args for passing in custom driver.<a name="line.66"></a>
<FONT color="green">067</FONT>       */<a name="line.67"></a>
<FONT color="green">068</FONT>      public Database(String... args) {<a name="line.68"></a>
<FONT color="green">069</FONT>        String methodName = ".Database ";<a name="line.69"></a>
<FONT color="green">070</FONT>    <a name="line.70"></a>
<FONT color="green">071</FONT>        // Set custom driver is passed into constructor. For testing failures.<a name="line.71"></a>
<FONT color="green">072</FONT>        if (args.length &gt; 0) {<a name="line.72"></a>
<FONT color="green">073</FONT>          driver = args[0];<a name="line.73"></a>
<FONT color="green">074</FONT>        }<a name="line.74"></a>
<FONT color="green">075</FONT>    <a name="line.75"></a>
<FONT color="green">076</FONT>        // Make sure the directory exists, creating it if not present.<a name="line.76"></a>
<FONT color="green">077</FONT>        File myIsernHome = new File(System.getProperty("user.home"), ".myisern");<a name="line.77"></a>
<FONT color="green">078</FONT>        myIsernHome.mkdirs();<a name="line.78"></a>
<FONT color="green">079</FONT>        File dbHome = new File(myIsernHome, "db");<a name="line.79"></a>
<FONT color="green">080</FONT>        dbHome.mkdirs();<a name="line.80"></a>
<FONT color="green">081</FONT>    <a name="line.81"></a>
<FONT color="green">082</FONT>        // Set the system property used by Derby to locate the db files.<a name="line.82"></a>
<FONT color="green">083</FONT>        Log.enter(className + methodName + "Database location " + dbHome.getAbsolutePath());<a name="line.83"></a>
<FONT color="green">084</FONT>        System.getProperties().put(derbySystemKey, dbHome.getAbsolutePath());<a name="line.84"></a>
<FONT color="green">085</FONT>      }<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>      /**<a name="line.87"></a>
<FONT color="green">088</FONT>       * Connect to database, create database if it does not exist.<a name="line.88"></a>
<FONT color="green">089</FONT>       */<a name="line.89"></a>
<FONT color="green">090</FONT>      public void connect() {<a name="line.90"></a>
<FONT color="green">091</FONT>        String methodName = ".connect() ";<a name="line.91"></a>
<FONT color="green">092</FONT>        try {<a name="line.92"></a>
<FONT color="green">093</FONT>          Class.forName(driver);<a name="line.93"></a>
<FONT color="green">094</FONT>          Log.enter(className + methodName + "Database driver loaded: " + driver);<a name="line.94"></a>
<FONT color="green">095</FONT>          connection = DriverManager.getConnection(connectionURL);<a name="line.95"></a>
<FONT color="green">096</FONT>          Log.enter("Database connected: " + connectionURL);<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>        catch (Throwable e) {<a name="line.98"></a>
<FONT color="green">099</FONT>          String msg = className + methodName + "Exception ";<a name="line.99"></a>
<FONT color="green">100</FONT>          msg = msg.concat(" " + e.getMessage());<a name="line.100"></a>
<FONT color="green">101</FONT>          Log.error(msg);<a name="line.101"></a>
<FONT color="green">102</FONT>          throw new RuntimeException(msg, e);<a name="line.102"></a>
<FONT color="green">103</FONT>        }<a name="line.103"></a>
<FONT color="green">104</FONT>      }<a name="line.104"></a>
<FONT color="green">105</FONT>    <a name="line.105"></a>
<FONT color="green">106</FONT>      /**<a name="line.106"></a>
<FONT color="green">107</FONT>       * Shutdown db, it will always throws a SQLException.<a name="line.107"></a>
<FONT color="green">108</FONT>       */<a name="line.108"></a>
<FONT color="green">109</FONT>      // public void disconnect() {<a name="line.109"></a>
<FONT color="green">110</FONT>      // String methodName = ".disconnect() ";<a name="line.110"></a>
<FONT color="green">111</FONT>      // try {<a name="line.111"></a>
<FONT color="green">112</FONT>      // this.connection.close();<a name="line.112"></a>
<FONT color="green">113</FONT>      // String msg = className + methodName + "completed.";<a name="line.113"></a>
<FONT color="green">114</FONT>      // Log.enter(msg);<a name="line.114"></a>
<FONT color="green">115</FONT>      // }<a name="line.115"></a>
<FONT color="green">116</FONT>      // catch (Exception e) { //NOPMD<a name="line.116"></a>
<FONT color="green">117</FONT>      // // Not needed.<a name="line.117"></a>
<FONT color="green">118</FONT>      // }<a name="line.118"></a>
<FONT color="green">119</FONT>      // }<a name="line.119"></a>
<FONT color="green">120</FONT>      /**<a name="line.120"></a>
<FONT color="green">121</FONT>       * Shutdown db, it will always throws a SQLException.<a name="line.121"></a>
<FONT color="green">122</FONT>       */<a name="line.122"></a>
<FONT color="green">123</FONT>      // public void shutdown() {<a name="line.123"></a>
<FONT color="green">124</FONT>      // String methodName = ".disconnect() ";<a name="line.124"></a>
<FONT color="green">125</FONT>      // try {<a name="line.125"></a>
<FONT color="green">126</FONT>      // this.connection.close();<a name="line.126"></a>
<FONT color="green">127</FONT>      // DriverManager.getConnection(this.shutdownURL);<a name="line.127"></a>
<FONT color="green">128</FONT>      // }<a name="line.128"></a>
<FONT color="green">129</FONT>      // catch (Exception e) {<a name="line.129"></a>
<FONT color="green">130</FONT>      // String msg = className + methodName + "completed.";<a name="line.130"></a>
<FONT color="green">131</FONT>      // Log.enter(msg);<a name="line.131"></a>
<FONT color="green">132</FONT>      // }<a name="line.132"></a>
<FONT color="green">133</FONT>      // }<a name="line.133"></a>
<FONT color="green">134</FONT>      /**<a name="line.134"></a>
<FONT color="green">135</FONT>       * Shows tables currently in database.<a name="line.135"></a>
<FONT color="green">136</FONT>       * <a name="line.136"></a>
<FONT color="green">137</FONT>       * @return List of tables in database.<a name="line.137"></a>
<FONT color="green">138</FONT>       */<a name="line.138"></a>
<FONT color="green">139</FONT>      public List&lt;String&gt; getTables() {<a name="line.139"></a>
<FONT color="green">140</FONT>        String methodName = ".getTables() ";<a name="line.140"></a>
<FONT color="green">141</FONT>        List&lt;String&gt; list = new ArrayList&lt;String&gt;();<a name="line.141"></a>
<FONT color="green">142</FONT>        List&lt;List&lt;String&gt;&gt; table;<a name="line.142"></a>
<FONT color="green">143</FONT>        ResultSet results = null;<a name="line.143"></a>
<FONT color="green">144</FONT>        try {<a name="line.144"></a>
<FONT color="green">145</FONT>          DatabaseMetaData metaData = this.connection.getMetaData();<a name="line.145"></a>
<FONT color="green">146</FONT>          results = metaData.getTables(null, null, null, null);<a name="line.146"></a>
<FONT color="green">147</FONT>          table = buildTable(results);<a name="line.147"></a>
<FONT color="green">148</FONT>        }<a name="line.148"></a>
<FONT color="green">149</FONT>        catch (Exception e) {<a name="line.149"></a>
<FONT color="green">150</FONT>          String msg = className + methodName + "Exception ";<a name="line.150"></a>
<FONT color="green">151</FONT>          msg = msg.concat(" " + e.getMessage());<a name="line.151"></a>
<FONT color="green">152</FONT>          Log.error(msg);<a name="line.152"></a>
<FONT color="green">153</FONT>          throw new RuntimeException(msg, e);<a name="line.153"></a>
<FONT color="green">154</FONT>        }<a name="line.154"></a>
<FONT color="green">155</FONT>        finally {<a name="line.155"></a>
<FONT color="green">156</FONT>          try {<a name="line.156"></a>
<FONT color="green">157</FONT>            if (results != null) {<a name="line.157"></a>
<FONT color="green">158</FONT>              results.close();<a name="line.158"></a>
<FONT color="green">159</FONT>            }<a name="line.159"></a>
<FONT color="green">160</FONT>          }<a name="line.160"></a>
<FONT color="green">161</FONT>          catch (Exception e) { // NOPMD<a name="line.161"></a>
<FONT color="green">162</FONT>            // Out of options.<a name="line.162"></a>
<FONT color="green">163</FONT>          }<a name="line.163"></a>
<FONT color="green">164</FONT>        }<a name="line.164"></a>
<FONT color="green">165</FONT>    <a name="line.165"></a>
<FONT color="green">166</FONT>        // Get table name from table, column 2.<a name="line.166"></a>
<FONT color="green">167</FONT>        for (List&lt;String&gt; row : table) {<a name="line.167"></a>
<FONT color="green">168</FONT>          list.add(row.get(2));<a name="line.168"></a>
<FONT color="green">169</FONT>        }<a name="line.169"></a>
<FONT color="green">170</FONT>        return list;<a name="line.170"></a>
<FONT color="green">171</FONT>      }<a name="line.171"></a>
<FONT color="green">172</FONT>    <a name="line.172"></a>
<FONT color="green">173</FONT>      /**<a name="line.173"></a>
<FONT color="green">174</FONT>       * Check if table is available in database.<a name="line.174"></a>
<FONT color="green">175</FONT>       * <a name="line.175"></a>
<FONT color="green">176</FONT>       * @param tableName name of table to check for.<a name="line.176"></a>
<FONT color="green">177</FONT>       * @return true if table is found.<a name="line.177"></a>
<FONT color="green">178</FONT>       */<a name="line.178"></a>
<FONT color="green">179</FONT>      public Boolean hasTable(String tableName) {<a name="line.179"></a>
<FONT color="green">180</FONT>        String methodName = ".hasTable() ";<a name="line.180"></a>
<FONT color="green">181</FONT>        List&lt;String&gt; tables = getTables();<a name="line.181"></a>
<FONT color="green">182</FONT>        Boolean found = false;<a name="line.182"></a>
<FONT color="green">183</FONT>        for (String table : tables) {<a name="line.183"></a>
<FONT color="green">184</FONT>          if (table.contentEquals(tableName)) {<a name="line.184"></a>
<FONT color="green">185</FONT>            found = true;<a name="line.185"></a>
<FONT color="green">186</FONT>          }<a name="line.186"></a>
<FONT color="green">187</FONT>        }<a name="line.187"></a>
<FONT color="green">188</FONT>        Log.enter(className + methodName + tableName + " found = " + found.toString());<a name="line.188"></a>
<FONT color="green">189</FONT>        return found;<a name="line.189"></a>
<FONT color="green">190</FONT>      }<a name="line.190"></a>
<FONT color="green">191</FONT>    <a name="line.191"></a>
<FONT color="green">192</FONT>      /**<a name="line.192"></a>
<FONT color="green">193</FONT>       * Generic SQL execute command, that does not return results.<a name="line.193"></a>
<FONT color="green">194</FONT>       * <a name="line.194"></a>
<FONT color="green">195</FONT>       * @param sql statement for command.<a name="line.195"></a>
<FONT color="green">196</FONT>       */<a name="line.196"></a>
<FONT color="green">197</FONT>      public void execute(String sql) {<a name="line.197"></a>
<FONT color="green">198</FONT>        String methodName = ".execute() ";<a name="line.198"></a>
<FONT color="green">199</FONT>        Log.enter(className + methodName + "start");<a name="line.199"></a>
<FONT color="green">200</FONT>        Statement statement = null;<a name="line.200"></a>
<FONT color="green">201</FONT>        try {<a name="line.201"></a>
<FONT color="green">202</FONT>          statement = this.connection.createStatement();<a name="line.202"></a>
<FONT color="green">203</FONT>          Boolean result = statement.execute(sql);<a name="line.203"></a>
<FONT color="green">204</FONT>          Log<a name="line.204"></a>
<FONT color="green">205</FONT>              .enter(className + methodName + "[" + sql + "] result set returned = "<a name="line.205"></a>
<FONT color="green">206</FONT>                  + result.toString());<a name="line.206"></a>
<FONT color="green">207</FONT>        }<a name="line.207"></a>
<FONT color="green">208</FONT>        catch (Throwable e) {<a name="line.208"></a>
<FONT color="green">209</FONT>          String msg = className + methodName + "Exception [" + sql;<a name="line.209"></a>
<FONT color="green">210</FONT>          msg = msg.concat("] " + e.getMessage());<a name="line.210"></a>
<FONT color="green">211</FONT>          Log.error(msg);<a name="line.211"></a>
<FONT color="green">212</FONT>          throw new RuntimeException(msg, e);<a name="line.212"></a>
<FONT color="green">213</FONT>        }<a name="line.213"></a>
<FONT color="green">214</FONT>        finally {<a name="line.214"></a>
<FONT color="green">215</FONT>          try {<a name="line.215"></a>
<FONT color="green">216</FONT>            statement.close();<a name="line.216"></a>
<FONT color="green">217</FONT>            this.connection.commit();<a name="line.217"></a>
<FONT color="green">218</FONT>          }<a name="line.218"></a>
<FONT color="green">219</FONT>          catch (Exception e) { // NOPMD<a name="line.219"></a>
<FONT color="green">220</FONT>            // Out of options.<a name="line.220"></a>
<FONT color="green">221</FONT>          }<a name="line.221"></a>
<FONT color="green">222</FONT>        }<a name="line.222"></a>
<FONT color="green">223</FONT>        Log.enter(className + methodName + "end");<a name="line.223"></a>
<FONT color="green">224</FONT>      }<a name="line.224"></a>
<FONT color="green">225</FONT>    <a name="line.225"></a>
<FONT color="green">226</FONT>      /**<a name="line.226"></a>
<FONT color="green">227</FONT>       * Updates table.<a name="line.227"></a>
<FONT color="green">228</FONT>       * <a name="line.228"></a>
<FONT color="green">229</FONT>       * @param sql statement for update.<a name="line.229"></a>
<FONT color="green">230</FONT>       * @param args list of arguments to insert in sql statement.<a name="line.230"></a>
<FONT color="green">231</FONT>       * @return count of rows updated.<a name="line.231"></a>
<FONT color="green">232</FONT>       */<a name="line.232"></a>
<FONT color="green">233</FONT>      public Integer update(String sql, String... args) {<a name="line.233"></a>
<FONT color="green">234</FONT>        String methodName = ".update() ";<a name="line.234"></a>
<FONT color="green">235</FONT>        Log.enter(className + methodName + "start");<a name="line.235"></a>
<FONT color="green">236</FONT>        PreparedStatement statement = null;<a name="line.236"></a>
<FONT color="green">237</FONT>        Integer result = 0;<a name="line.237"></a>
<FONT color="green">238</FONT>        try {<a name="line.238"></a>
<FONT color="green">239</FONT>          statement = this.connection.prepareStatement(sql);<a name="line.239"></a>
<FONT color="green">240</FONT>          Log.enter("sql = " + sql);<a name="line.240"></a>
<FONT color="green">241</FONT>          for (int i = 0; i &lt; args.length; i++) {<a name="line.241"></a>
<FONT color="green">242</FONT>            Log.enter("args = " + args[i]);<a name="line.242"></a>
<FONT color="green">243</FONT>            String item = "";<a name="line.243"></a>
<FONT color="green">244</FONT>            if ((args[i] != null) &amp;&amp; (!args[i].isEmpty())) {<a name="line.244"></a>
<FONT color="green">245</FONT>              item = args[i].substring(0, Math.min(254, args[i].length()));<a name="line.245"></a>
<FONT color="green">246</FONT>            }<a name="line.246"></a>
<FONT color="green">247</FONT>            item = item.trim();<a name="line.247"></a>
<FONT color="green">248</FONT>            if (item.isEmpty()) {<a name="line.248"></a>
<FONT color="green">249</FONT>              item = " ";<a name="line.249"></a>
<FONT color="green">250</FONT>            }<a name="line.250"></a>
<FONT color="green">251</FONT>            Log.enter("param = " + item);<a name="line.251"></a>
<FONT color="green">252</FONT>            statement.setString(i + 1, item);<a name="line.252"></a>
<FONT color="green">253</FONT>          }<a name="line.253"></a>
<FONT color="green">254</FONT>          result = statement.executeUpdate();<a name="line.254"></a>
<FONT color="green">255</FONT>          Log.enter("result set returned? = " + result.toString());<a name="line.255"></a>
<FONT color="green">256</FONT>        }<a name="line.256"></a>
<FONT color="green">257</FONT>        catch (Throwable e) {<a name="line.257"></a>
<FONT color="green">258</FONT>          String msg = className + methodName + "Exception [" + sql;<a name="line.258"></a>
<FONT color="green">259</FONT>          msg = msg.concat("] " + e.getMessage());<a name="line.259"></a>
<FONT color="green">260</FONT>          Log.error(msg);<a name="line.260"></a>
<FONT color="green">261</FONT>          throw new RuntimeException(msg, e);<a name="line.261"></a>
<FONT color="green">262</FONT>        }<a name="line.262"></a>
<FONT color="green">263</FONT>        finally {<a name="line.263"></a>
<FONT color="green">264</FONT>          try {<a name="line.264"></a>
<FONT color="green">265</FONT>            statement.close();<a name="line.265"></a>
<FONT color="green">266</FONT>            this.connection.commit();<a name="line.266"></a>
<FONT color="green">267</FONT>          }<a name="line.267"></a>
<FONT color="green">268</FONT>          catch (Exception e) { // NOPMD<a name="line.268"></a>
<FONT color="green">269</FONT>            // Out of options.<a name="line.269"></a>
<FONT color="green">270</FONT>          }<a name="line.270"></a>
<FONT color="green">271</FONT>        }<a name="line.271"></a>
<FONT color="green">272</FONT>        Log.enter(className + methodName + "end");<a name="line.272"></a>
<FONT color="green">273</FONT>        return result;<a name="line.273"></a>
<FONT color="green">274</FONT>      }<a name="line.274"></a>
<FONT color="green">275</FONT>    <a name="line.275"></a>
<FONT color="green">276</FONT>      /**<a name="line.276"></a>
<FONT color="green">277</FONT>       * Query table and return results as a 2-D List&lt;String&gt;.<a name="line.277"></a>
<FONT color="green">278</FONT>       * <a name="line.278"></a>
<FONT color="green">279</FONT>       * @param sql statement for query.<a name="line.279"></a>
<FONT color="green">280</FONT>       * @param args list of paramaters to insert into sql string.<a name="line.280"></a>
<FONT color="green">281</FONT>       * @return 2-D List representing table results.<a name="line.281"></a>
<FONT color="green">282</FONT>       */<a name="line.282"></a>
<FONT color="green">283</FONT>      public List&lt;List&lt;String&gt;&gt; query(String sql, String... args) {<a name="line.283"></a>
<FONT color="green">284</FONT>        String methodName = ".query() ";<a name="line.284"></a>
<FONT color="green">285</FONT>        PreparedStatement statement = null;<a name="line.285"></a>
<FONT color="green">286</FONT>        ResultSet results = null;<a name="line.286"></a>
<FONT color="green">287</FONT>        List&lt;List&lt;String&gt;&gt; table = new ArrayList&lt;List&lt;String&gt;&gt;();<a name="line.287"></a>
<FONT color="green">288</FONT>        try {<a name="line.288"></a>
<FONT color="green">289</FONT>          statement = this.connection.prepareStatement(sql);<a name="line.289"></a>
<FONT color="green">290</FONT>          for (int i = 0; i &lt; args.length; i++) {<a name="line.290"></a>
<FONT color="green">291</FONT>            String item = "";<a name="line.291"></a>
<FONT color="green">292</FONT>            if ((args[i] != null) &amp;&amp; (!args[i].isEmpty())) {<a name="line.292"></a>
<FONT color="green">293</FONT>              item = args[i].substring(0, Math.min(254, args[i].length()));<a name="line.293"></a>
<FONT color="green">294</FONT>            }<a name="line.294"></a>
<FONT color="green">295</FONT>            statement.setString(i + 1, item);<a name="line.295"></a>
<FONT color="green">296</FONT>          }<a name="line.296"></a>
<FONT color="green">297</FONT>          results = statement.executeQuery();<a name="line.297"></a>
<FONT color="green">298</FONT>          table = buildTable(results);<a name="line.298"></a>
<FONT color="green">299</FONT>          Log.enter(className + methodName + "[" + sql + "] result count = " + table.size());<a name="line.299"></a>
<FONT color="green">300</FONT>        }<a name="line.300"></a>
<FONT color="green">301</FONT>        catch (Throwable e) {<a name="line.301"></a>
<FONT color="green">302</FONT>          String msg = className + methodName + "Exception [" + sql;<a name="line.302"></a>
<FONT color="green">303</FONT>          msg = msg.concat("] " + e.getMessage());<a name="line.303"></a>
<FONT color="green">304</FONT>          Log.error(msg);<a name="line.304"></a>
<FONT color="green">305</FONT>          throw new RuntimeException(msg, e);<a name="line.305"></a>
<FONT color="green">306</FONT>        }<a name="line.306"></a>
<FONT color="green">307</FONT>        finally {<a name="line.307"></a>
<FONT color="green">308</FONT>          try {<a name="line.308"></a>
<FONT color="green">309</FONT>            statement.close();<a name="line.309"></a>
<FONT color="green">310</FONT>            this.connection.commit();<a name="line.310"></a>
<FONT color="green">311</FONT>            if (results != null) {<a name="line.311"></a>
<FONT color="green">312</FONT>              results.close();<a name="line.312"></a>
<FONT color="green">313</FONT>            }<a name="line.313"></a>
<FONT color="green">314</FONT>          }<a name="line.314"></a>
<FONT color="green">315</FONT>          catch (Exception e) { // NOPMD<a name="line.315"></a>
<FONT color="green">316</FONT>            // Out of options.<a name="line.316"></a>
<FONT color="green">317</FONT>          }<a name="line.317"></a>
<FONT color="green">318</FONT>        }<a name="line.318"></a>
<FONT color="green">319</FONT>        return table;<a name="line.319"></a>
<FONT color="green">320</FONT>      }<a name="line.320"></a>
<FONT color="green">321</FONT>    <a name="line.321"></a>
<FONT color="green">322</FONT>      /**<a name="line.322"></a>
<FONT color="green">323</FONT>       * Builds a 2-D List of strings from a result set.<a name="line.323"></a>
<FONT color="green">324</FONT>       * <a name="line.324"></a>
<FONT color="green">325</FONT>       * @param results from a database query<a name="line.325"></a>
<FONT color="green">326</FONT>       * @return 2-D list results<a name="line.326"></a>
<FONT color="green">327</FONT>       * @throws Exception if db error occurs.<a name="line.327"></a>
<FONT color="green">328</FONT>       */<a name="line.328"></a>
<FONT color="green">329</FONT>      private List&lt;List&lt;String&gt;&gt; buildTable(ResultSet results) throws Exception {<a name="line.329"></a>
<FONT color="green">330</FONT>        List&lt;List&lt;String&gt;&gt; table = new ArrayList&lt;List&lt;String&gt;&gt;();<a name="line.330"></a>
<FONT color="green">331</FONT>        ResultSetMetaData metaData = results.getMetaData();<a name="line.331"></a>
<FONT color="green">332</FONT>        Integer columnCount = metaData.getColumnCount();<a name="line.332"></a>
<FONT color="green">333</FONT>        while (results.next()) {<a name="line.333"></a>
<FONT color="green">334</FONT>          List&lt;String&gt; row = new ArrayList&lt;String&gt;();<a name="line.334"></a>
<FONT color="green">335</FONT>          for (int i = 1; i &lt;= columnCount; i++) {<a name="line.335"></a>
<FONT color="green">336</FONT>            row.add(results.getString(i));<a name="line.336"></a>
<FONT color="green">337</FONT>          }<a name="line.337"></a>
<FONT color="green">338</FONT>          table.add(row);<a name="line.338"></a>
<FONT color="green">339</FONT>        }<a name="line.339"></a>
<FONT color="green">340</FONT>        return table;<a name="line.340"></a>
<FONT color="green">341</FONT>      }<a name="line.341"></a>
<FONT color="green">342</FONT>    }<a name="line.342"></a>




























































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